/Engine/Plugins/Runtime/CommonUI/Source/CommonUI/Public/Groups/CommonButtonGroupBase.h
Find the button index of the specified button, if possibleIndexof the button in the group. INDEX_NONE if not found
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=BaseButtonGroup) int32 FindButtonIndex ( const [UCommonButtonBase](API\Plugins\CommonUI\UCommonButtonBase) * ButtonToFind ) const